houtson
Well-known member
I'm looking to emulate a tone control in a part of an audio effect. Trying to achieve specific low frequency and high frequency attenuation.
The spec's I'm trying to achieve are 6db/octave roll-off with a corner frequencies of 280 Hz at the low end and 4000Hz at the high end.
I'm using the biquad with high and low shelves at the moment as an approximation, it doesn't sound quite right and I also note the comment on the design tool of trouble with corner frequencies below 400Hz.
I'm familiar with the Audio Library but not filter design. I know you can pass them specific coefficients but not sure where to start to achieve the above spec. especially with the low corner frequency.
I'm assuming some sort of high pass at 280Hz in serial with a low pass at 4000Hz.
The question is : is this best approach, which objects would I use and how would I calculate the coefficients, any help appreciated.
Cheers, Paul
The spec's I'm trying to achieve are 6db/octave roll-off with a corner frequencies of 280 Hz at the low end and 4000Hz at the high end.
I'm using the biquad with high and low shelves at the moment as an approximation, it doesn't sound quite right and I also note the comment on the design tool of trouble with corner frequencies below 400Hz.
I'm familiar with the Audio Library but not filter design. I know you can pass them specific coefficients but not sure where to start to achieve the above spec. especially with the low corner frequency.
I'm assuming some sort of high pass at 280Hz in serial with a low pass at 4000Hz.
The question is : is this best approach, which objects would I use and how would I calculate the coefficients, any help appreciated.
Cheers, Paul